Loom-dobby



F. LEEMING.

LO0M BOBBY.

Armclmnn mso fu. l5. 19|?.

1,371,564. Patenwd Mar. 15, 1921.

5 SHEETS-SHEET l.

p11' j WK F. LEEMING.

LOOM DOBBVY.

APPLICATION H1111 ma. 15, 1917.

m6111611 Mar. 15,1921.

5 SHEETS-SHEET 2.

F. LEER/HNE.

LOOM DOBBY. APPLICATION FILED FEB.15.|9H.

Paenfe Mar. E59 @EL 5 SHEETS-SHEET 3- F. nimma. [00M BOBBY.

APPLICATION FILED ill. I5, 19|?.

131mm nr. 15, 1921.

5 SHEETS-SHEET 4.

F. LEEMING.

v Loon oosav. APPLIFATIOI HLD FEI. 15| 19|]- Patented 1hr. 15, 1921.

5 SHEETS-SHEET 5.

sov

UNITED STATES 'P'IEINI'If OFFICE.

FRANK LEEMING, or GUISELEY, NEAR LEEDS, ENGLAND.

LOOM-BOBBY.

To cH w/Lcm it lmay concern Be it known that l, F RANK LnEMiNG, asubject ot the King o'l Great Britain, and resident or' Guiseley, nearLeeds, in the county oi York, England, have invented Ya certain new anduseful Improvement inV LooniDobbies, oi which the following description,having reference to the accompanying sheets of drawings, is a specification.

My invention relates to dobbies wherein toothed crankwheels are made useot for transmitting motion to the healds or heddles in looms 'forweaving. Heretoiore these toothed crank wheelshave usually been arrangedwith their operating part and. connections thereto, so that their changeof psition has been eitected by the pattern surfaceY mechanism movingsaid toothed crank wheels into ge `r with their operating partly toothedbarrels. ln such cases, therefore the said movei'nents of the crankwheels b v the pattern surface have had to be effected while yet saidtoothed crank wheels were sustaining the weight of the healds and warpthreads which they had to operate, hence said weight of the healds andwarp threads and' other forces acting thereon had a detrimental eiectupon the pattern surieaccwhjich controls and moves their said operatingcrank wheels as is well known.

To overcome this objectionable feature it has been proposed to arrangesaid crank wheels to rotate about iiXed centers and in my invention Iuse this arrangement and I provide improved devices for controlling andcarrying out the rotary motions or" said crank wheels. No weight of warpor healds or any Vtorce in connection therewith in any way interfereswith the tree movement of the patternvsurtace mechanism which controlsthe actions ot said crank wheels.

ln order that my said invention may be eadily understood, I havehereunto appended sheets of drawings illustrative thereot to which byfigures and letters, reference is ma de in the following descriptionVFigure i is a back elevation oi dobbyv mechanism produced in accordancewith my invention.

Fig. 2 is a back sectional elevation of the partsillustrated by Fig. 1.

Fig. 3 is a sectional end elevation as seen in the' direction indicatedby the arrow c and as taken on line A-B of Fig.-2.

Fig. 4 is a sectional front Velevation of a Specification ofLettcrsratent.

Application led February 15, 1917. Seria]y No.l 148,848.

lever actuated by the pattern surface mechA anisin the same being showniny detail and hereinafter more particularly described.

F 1g. 5 is a front elevation of a partly toothed wheel and parts inconnection therewith mounted within and operated bv the lever shown byFig. 4. Engaging with said partly toothed wheel is illustrated apartlytoothed crank Wheel.

Fig. 6 is a sectional end elevation oiI the partly toothed wheel andcrank Wheel shown by Fig. 5.

igs. 7 and 8 are sectional end elevations taken on Vline 'C D ofportions of the lever illustrated by Fig. 4 and as seen'in oppositedirections in order to illustrate inclined formations made edgewise insaid levers tor the purposes hereinafter described.

Fig.v 9 illustrates parts in detail hereinafter explained.

Fig. 1,0 is an elevation of the front jack lever and the several partsoperating in connection with it, while Fig. l1 is a similar elevation ofthe next jack lever behind it alsowith the several parts in connectionwith it. In both cases the framework is omitted for thel sake ofclearness.

ll indicates the framesides of a dobby and F a portion of the frameworkof a loom upon which said dobby mechanism is mounted.

The type ot' dobby mechanism to which my invention relates is the one inwhich toothed crank wheels are made use of for operating the jacklevers.

In the usual mechanism these crank wheels are operated by continuouslyrotating partly toothed drums, however instead of making use oi' saidpartly toothed drums I make use oi" the devices hereinafter fullydescribed.

The jack levers 2 and 2c in the dobby are, as in the ordinary manner)pivoted upon a cross shaft fr which extends from one trameside to theother frameside E of said dobby. These jack levers 2, 2a are connectedin al tornate positions to the toothed crank wheels 4f. and la in suchorder that the series oi' crank wheels 4 are connected to the verticalarms 26 of the levers 2 by their connecting rods 3 while the crankwheels 4c are connected to the horizontal arms 2c of the levers 2a bythe connecting rods 3a. The shape or formation of the curved parts onthe levers 2 and 2a Where the pivotal connections'tor their respectiverods 3 and 3a i dobbies.

.are situated, is asishown by Fil. 2 So that the extending parts 2d andA2c-respectvely may cover said pivotal connections 1n position as is Wellknown to'themakers of The arrangement of the crank Wheels 4 and ta tooccupy alternate position is made use of ink order: to .give space Vforthe altered or new construction of operating-devices for the crankWheels 4 and la While yet keeping all of the said operating devicesWithin the Width of the series'of jack levers 2 and 2a, that is to say,by placing the two sets of crank 'Wheels 4', la in the two'positionsdescribed lhave in each case the full Width of two levers 2, 2a in whichto place the operating devices for the crank .Wheels l' and in likemanner l can again vhave tivo sets of operating devices for the crankWheels 4a thus the Width or pitch of the jacirlevers 2, 2a is notincreased by the y employment of my .improved mechanism, but said Widthis kept Within the Width of the healds that the jack levers have toopcrate as though the ordinary devices were employed for operating saidcrank Whg-:elsV 14C and 4ta,

Y ln cases Where the width ofthe healds is not limited, then only oneset of crank wheels maybe .used for Yoperating,the jack levers veach ofwhich in such circumstances mightbe equal in Width 'to the full width ofits operatiiigfcrank Wheel and the parts which :rotate saidcrank Wheel.

is is Well known in dobby mechanism of this type, as heretoforeconstructed, it is usual to make use of partly toothed drums lforoperating the toothed crank Wheels, said partly toothed drums beingrotated convtinuously during the movements of the Vdobby mechanism. Inplace of these drums I noivy make use of the continuously rotating`cross shafts 10, lOwWhich have mounted upon them the series -of partlytoothed These piece c which is mounted upon a hub extending laterallytherefrom. The series of partly toothed wheels l2. 12a are arranged toslide longitudinally over their V respective shafts 10,100; but have theIcontinuous motion of said shafts 10, a transmitted to them by means ofthekeys 11 l and 11a which are secured to said shafts vThe-series ofcrank wheels 4, #la are respectively mountedupon studs 5, 5a car-V riedbyzappropriate brackets 6, 6a, so that they may revolve freely uponvsaid vstuds 5, '5a when actuated by their respective partly toothedWheels 12 and 12a. brackets 6, 6a are mounted upon thesupporting shafts7, '70, which Yeitend from the ,frame side E Von one side of the dobbytoVV that on the other in order to support said brackets 6, 6a,I Whilethe extending and the Yforked ends g, g1 ofthe bracket 6, 6arespec-tively enter supporting grids 8 and` Sa which retain tliein intheir -proper positions laterally. rllie .adjustable cross shafts orbars 9, 9a. are employed to secure and support the brackets 6, 6a in`position relatively with their operating partly-toothed-wheels 12and'12a. Y Y A y .iis hereinbefoi'e stated each partly toothed The Kwheel 12 and 12a has its respective annular V'piece o' mounted upon 'ahub Z7 (see 6)V which is formed laterally V upon each of said' Wheels12, v12a and this annular piecey 0` is retained in position thereon by aflange lixed on .the outer end of the hub fisso "that While the wheel 12taking Within said annular piece mayV freely rotate therein it may yethave motion transmitted to it its annular vpiece c to cause it tomovelongitudinally over its shaft `10 or10a. Y

l Each of the, annular pieces c has pins or projection 7, f1 extendingradially or diametrically from it (as shown by Fig 5) so thatthey (saidpins f, f1) lmay take'into slots g; g1 formed in` theirrespective vlever14 or lef-.(11, While the outer edges o1, c? of. the annular pieces care curved as shoivnby in order to take against the curved surfaces 7c,761 formed in each ,of the aforesaid levers 14.- and 14a as shown byFig. 4. VThe fitting of these surfaces c1, o2 against the surfaces79,]c1'lis to permitfreedom of inotion for tlielevers 14, lll@ Whilelyet holding Ythe annular pieces @against rotation.

Ais Ywill be observed the slots g, g1 are of the inclined formationillustrated by Figs. 7 andS 'in order that-the actionsfof said ist` lll)

inclines as the lever 14er 14a upon `which they are formed is beingraised or lowered, that is to say is being moved radially about itsrespective shaft 10 or 10a) KVWill have the effect of causing the pins7, f1 to move in a,

direction longitudinally over the shaft 10, 10a thus the said actionswill 'transmit inotion in. a lateral direction to 'the partly toothedWheels 12 and 12a. Y

This lateral `motion of the Wheels `12 and 12a takes them into and outof gear (as the case may` be) With their respective crank Wheels and lain order to transmit motion thereto or to leave same inoperative as-maybe desired and as is controlled by the pattern surface mechanism.

The two series of levers 14 and '14a Vwhich actuate the annular pieces care shaped in the two forms illustrated by Fig. 2, so that the patternsurface mechanism may act thereon causing said lever 11ior 14a to riseor fall as the case may be and as is well understood. The risingmovement of the levers le or 14a is arranged to have the eliect vofsliding their partly toothed wheels 12 or 12a npon their respectiveshafts to cause them to engage with its respective crank wheel e or lathereby giving motion to its jack levers and their respective healds vinmanner well known. This risingmovement of the levers it and 14a ispreferably employed 'for putting the partly t othed wheels intoeiiective operation with their crank wheels, since by this arrangement abowl 15a; (or if peg-lags are employed then a peg inthe lag) on thepattern surface mechanism 15 will indicate to bring about a movement ofthe lieald either causing said lieald to rise or to descend from itsraised position as the casemay be. By this arrangement it is alwaysremembered that to give motion tol any heald at any time, a bowl (or apeg) must beV placed in the pattern surface to effect this, whereas whenthe heald has to remainv stationary then its pattern surface is blank orVhas no bowl (or The toothed crank Vwheels et, 4a have certain parts oftheir peripheries my (see Fig. formed to tit upon or take against thetoothless parts n of thepartly toothed wheels 12 or 12u'l so that oneachl engagement of these teeth with the teeth on the crank wheels e orla these are rotated through half a revolution and are then arrested andheld `troni further movement by thus fitting` against the said toothlessparts of the wheels 17 or 12a. The crank pins y) whenv their wheels etor c are thus` stationary are arranged so that the Jr'orces actingthrough their connectingrods 3, 3a do so in a direct line through the'center ot the crank wheel thus said forces are withstood by thev axialstuds of the crank wheels Ll or 4a on account o'i their dead centerpositions. Y

lllhen the partly toothed wheels 12 or 12a are moved'laterally out ofgear with their` crank wheels Lt or eta then the annular pieces c arebroughtinto position so that the parts m on Vsaid crank wheels et or lamay take Vagainst the properly curved or seinicylindrical partormed uponsaid annular pieces c thereby to be held against rotation as they arewhenl in contact with the toothless l/l ot their operating wheels 12,12a.

Vi`he cross shafts 9`r 90, are held in position by springs when it isdesired to have such means :it release in order that should the partlytoothed crank wheels not properly engage with their partly tootheddriving wheels then said springs yield to prevent breakages. As suchyielding spring devices pa rts are not absolutely necessary they are notillustrated by the drawings.

To permit the jack levers 2, 2a to be readily detached or removed fromposition in the machine. their pivotal openings are made to `span theirshaft 'r upon which they are mounted and upon which they are retained bythe cross bar s in manner well known. The said jack levers Cl are alsoguided in their pat-hsl by their vertical and horizontal armsrespectively taking through the grids or guiding parts t, 151.

The leve-rs 14, 1de are niade to span their pivotal shaft /i upon whichthey are mount ed so that by turning the holding bar u. out ol theposition shown by Fig. 2 into a position beneath .the sha-ft i any oneor all of said levers 14, 14a may be freely removed trom the machine.

is means for enablingr the healds to be brought to a central position 1make use of levers 19 and 19av which are pivoted upon the cross bar 7Lso that I may mount upon lateral arms extending from said levers 19, 19aother cross bars 20, 20a which will take beneath thetwo series of levers'14. 1hry respectively in order that when the hand lever 21 (whichextends from the front to about a central position in the loom) isoperated bythe weaver it would cause the levers 1Q. 19a to rise by beingcoupled thereto through the medium of the connecting rod 22 and acrossshaft 213 which extends between saial levers 19, 19a (which are situatedat the back and front or' the machine) thus when said bars 20, a areraised the series ol? partly toothed wheels 12 and 12a will be movedlaterally and will be caused to engage with their respective crankwheels Ll and l-(f,

When the wheels l2, 12a and al, la are thus brought into gear, theweaver will throw out ot gear the well known clutch which couples thevertical driving shaft 24 to the motor shaft of the loom. at which timeall the rotary parts ont the machine, including` the vertical shaft 251,are free to be rotated by hand. To enable vthe weaver `to manuallyrotate said rotary parts a hand-wheel ot' well known formation andtherefore not shown in the drawings) is lixed upon the l'ront outer endotV the shaft 10a. hence when said hand wheel is rotated by the weaverall the crank wheels are also rotated and on these latter heine` turneda quarter of a revolution all the threads oit warp are brought to acentral position. c

The pattern barrel l5 has intermittent ro tary motion transmitted to itfrom the shaft l0/zy through the medium of the wheel 27av and the wheel28 which latter is mounted to revolve loosely upon the end of the. fixedshatt- Ta. To the rear of this wheel is fixed a partly toothed wheel 29(see Fig. Q) which. is arranged to transmit motion to a wheel 30 mountedupon the shaft 157) ot the pattern barrel 15. This Wheel 30 has certainot its teeth at il; made shorter than the others so that when broughtinto the position shown by Fi. 9 `the two teeth adjoining one orotherlot' thev short teeth w will come into contact with the toothless part.frV ipon the partly toothed ivhecl 29 by which means as the wheel 29rotates it transmits intermittent motion to the Wheel 30 and vafter suchmotion locks saidjvvheel in position will be understood. l

The pattern barrel 15- is mounted upon the arms f levers 31 and 31awhich are also loosel'g.Y mounted upon the fixed shaft 7a, in order thatby the connecting rods 32 Vat thev lower ends of said levers 31 takingthrough openings in iXed projections y/ extending from the framework E aspring 33 may he mounted on each tov yield providedtor any cause it isdesirable that the pattern barrel should move away from the levers 14j14a rather than causeY damages thereto or ,to other parts. i

The adjustingV of the tension of the springsk 33 is eiected by the nutda-While thev adjustment of the position oi' the pattern barrel 15 iseffectedl by the nut 35.

Since dobby mechanism constructed as 's hereinbctore described is of asubstantial `character and occupies comparatively little i space,portions of saine may be made use of to carry out the movements otchange shuttle boxes as Will be understood.

Such lbeing the nature and objectot in v 'Said invention what Icla1m,is:-

1. ln a loom dobby, jack levers, a support v for saidV jack levers,toothed-crank-ivheels, -connecting rods,v mounted upon said jack levers7to connect same to said toothed-crankv Wheels, brackets for supportingsaid toothedcrank-Wheels, partly toothed Wheels engagingwith saidtoothed crank-wheels, shafts upon which said partly-toothed Wheels aresplined, annular pieces mounted upon the hubs of said partly toothedwheels, levers having inclined slots to receive projections extendingfrom said annular pieces and patternvsuriace mechanism tor operatingsaidV levers. y f 2. In a loom dobby, jack levers,A a support for saidjack levers,- toothed crank- Wheels, horizontally disposed connectingrods coupled to the vertical arms of certain of said jack levers andvertically disposed connecting rods coupled to the hori- VZoiital armsof the other jack levers, two series of toothed crank wheels one serieshaving the horizontally disposed connecting rods coupled to them Whilethe otherseries have the vertically disposed connecting rodsconnectingrod device coupled to them, partly toothed Wheels torengagement `With said crank Wheels, rotary shafts upon which lsaidpartly toothed Wheels are mounted,` means ior moving said partly toothedWheels longitudinally over said shafts and means for controlling saidmovements. Y l

3. lnia loom ,dobby,` jack levers, a sup'- port for said jack levers,toothed kcrank Wheels-connecting rods mounted upon said jack levers toconnect same to said toothed crank Wheels, a separate lined supporttoi)V each otsaid toothed crank Wheels;partlyY toothed Wheels vforengaging with said toothedcrank Wheels, shafts tor supporting androtating said partly toothed Wheels, annular pieces mounted upon thehubs olf sai` partly toothed Wheels, levers having inclined slots toreceive vprojections extending Afrom said annular pieces, Y andwpatternsurfaceI mechanism for operating said levers.

4. ln a loom dobbyyjack levers7 a support for said jack levers. toothedcrank Wheels, connecting` rods tor lcoupling said jack levers to saidtoothed craifikwheels` lined supports n for "said toothed crank Wheels,partly toothedivheelsfor engaging with said toothed crank Wheels, saidtoothed crank Wheels having hubs or parts adjoining them which Willengage with the toothed crank Wheels `to hold same against rota- Y tion,shafts upon which said partly-toothed Wheels, are splined, annular.pieces mounted upon thehubs of said partly toothed Wheels,

levers having inclined slots to receive projack levers, a sup-V shaftsupon whichl said partly toothed- Wheels are splined7 annular rpiecesmounted lltl uponthe hubs of said partly toothed Wheels. l

levers having inclined slots to receive projections extending froingsaidannular 'piecesy cross bars tor engaging Vthe levers which have inclinedslots,=levers uponivhich said cross bars are mounted and a Vhand `leverand` s for .operating said levers. Y

FRANK

